package day06;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import javax.swing.JFrame;
@SuppressWarnings("serial")
class Cardioid extends JFrame{
    //定义窗口大小
    private static final int WIDTH = 600;
    private static final int HEIGHT = 800;
    //获取屏幕大小
    private static int WINDOW_WIDTH = Toolkit.getDefaultToolkit().getScreenSize().width;
    private static int WINDOW_HEIGHT = Toolkit.getDefaultToolkit().getScreenSize().height;
    //构造函数
    public Cardioid(){
        //设置窗口标题
        super("?型线");
        //设置背景颜色
        this.setBackground(Color.BLACK);
        //设置窗口位置
        this.setLocation((WINDOW_WIDTH-WIDTH)/2,(WINDOW_HEIGHT-HEIGHT)/2);
        //设置窗口大小
        this.setSize(WIDTH,HEIGHT);
        //设置窗口布局
        this.setLayout(getLayout());
        //设置窗口可见
        this.setVisible(true);
        //设置窗口默认关闭方式
        this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    }
    public void paint(Graphics g){
        double x,y,r;//横纵坐标及半径
        Image image = this.createImage(WIDTH,HEIGHT);
        Graphics pic = image.getGraphics();
        //绘制图形
        for (int i = 0;i<135;i++){
            for (int j = 0; j < 100; j++) {
                r = Math.PI/45+Math.PI/45*i*(1-Math.sin(Math.PI/45*j))*18;
                x=r*Math.cos(Math.PI/45*j)*Math.sin(Math.PI/45*i)+WIDTH/2;
                y = -r*Math.sin(Math.PI/45*j)+HEIGHT/2;
                pic.setColor(Color.MAGENTA);
                pic.fillOval((int) x,(int) y,2,2);
            }
            //生成图片
            g.drawImage(image,0,0,this);
        }
    }
    public static void main (String[] args){
        new Cardioid();
    }

}
public class practice03 {
}
